30589828 AB33EC-B Conductivity Meter with LCD with Backlight and One-Line Dot Matrix, Electrode Not Included by Ohaus

30589829 AB33EC-F Conductivity Meter with LCD with Backlight and One-Line Dot Matrix, Electrode STCON7 by Ohaus

TDS-4TM Aquarium TDS Meter with Digital Thermometer by HM Digital

HM-ZT-2 Basic Handheld TDS Meter by HM Digital

HPK-1 COM-100, PH-200, Hydroponics Pro Meter Kit by HM Digital

LDM-100R Commercial Grade EC/TDS Monitor by HM Digital

LSM-100 Commercial Grade EC/TDS Monitor by HM Digital

DM-2EC Commercial In-Line Dual EC Monitor by HM Digital

DM-1 Commercial In-Line Dual TDS Monitor by HM Digital

DM-2 Commercial In-Line Dual TDS Monitor by HM Digital

HM-100 Continuous pH/EC/TDS/Temp Monitor by HM Digital

PS-203 Dual Display TDS Controller by HM Digital

PSC-64D Dual Display, Dual Line EC/TDS Monitor w/ 4-20mA Output by HM Digital

SP-2 Dual TDS Sensor Probes (for DM-1) by HM Digital

SP-3 Dual TDS Sensor Probes (for DM-2) by HM Digital

PSC-150 Extended Range EC/TDS Controller by HM Digital

PM-2 External In-Line TDS Purity Monitor by HM Digital

AI103G GroStar EC / 500ppm / 700ppm Pen Tester Kit by Apera Instruments

TDS-3 Handheld TDS Meter with Carrying Case by HM Digital

HM-500 HydroMaster Continuous pH/EC/TDS/ temperature monitor by HM Digital

SM-1 In-line Single TDS Monitor by HM Digital

SM-1WOF In-line Single TDS Monitor w/o T-Fitting by HM Digital

PI0208S John Guest 1/4" Union Tee Fitting - Supplementary to SM-1, DM-1, DM-2, DM-2EC, TRM-1, QC-1 by HM Digital

PM-1 OEM In-Line TDS Purity Monitor by HM Digital

COM-80 Pen Style TDS/EC/Temp Meter by HM Digital